Loans Receivable (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loans Receivable [Line Items]
Loans receivable	$ 456,533,000		$ 401,961,000
Valuation allowance of loans receivable	6,182,000		5,620,000
Impaired loans, with a valuation allowance at cost	3,003,000		1,775,000
Impaired loans, without a valuation allowance at cost	30,000,000		31,023,000
Impaired loans, unpaid principal balance	36,003,000		35,872,000
Decrease in valuation allowance	62,000	(6,896,000)
Loans receivable charged off	463,000	85,000
Loans and Leases Receivable, Impaired, Nonperforming, Nonaccrual of Interest	3,000,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	700,000	200,000
Aggregate Amortized Cost Of Six Largest Loans	243,000,000
Aggregate Fair Value Of Six Largest Loans	250,000,000
Aggregate Cost Basis Of Loans Considered Impaired	30,000,000
Specific Valuation Allowance [Member]
Loans Receivable [Line Items]
Valuation allowance of loans receivable	3,500,000		3,000,000
General Valuation Allowance [Member]
Loans Receivable [Line Items]
Valuation allowance of loans receivable	$ 2,682,000		$ 2,620,000